DSH 412 Detection of fault

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DSH 412 ( c' n$ h% m+ F+ R 5 }! f0 ]$ L/ i% k; N$ v, m! ^( T

Detection of fault 4 }3 {0 z$ s% v- r% x

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60601-1(ed.2);am1;am2

Standard(s)- (year and edition):
IEC 60601-1:1988 Ed.2 Am1+Am2
. J9 O6 e" v) LSub clause(s):
6 J# h% r3 d9 Z. ISheet n°: DSH-412
& u+ b* u$ ?8 nSubject: Detection of fault
0 d6 r8 f' B2 G7 bKey words: SFC, detection, fault
* b8 g% L' V/ ~( Z6 A2 `Confirmed by CTL at its 39th meeting, in Cologne
Question:
% Y1 Q! }: b6 z, xShall a fault which remains undetected be considered a NORMAL CONDITION (NC) or a
SINGLE FAULT CONDITION (SFC)?
' f) j7 J8 V8 S9 ^+ O8 u: ?If every fault is considered as SFC, regardless of whether it is detected or not, the
" k; d8 O. j* |consequence will be that there is no protection required against situations where an
undetected first fault is followed by a second fault which may cause a SAFETY HAZARD.
Decision:
If a fault is not detected (for example by periodic inspection, maintenance, auto test, etc....), it
  W5 ^5 G% K5 {3 D1 Y. vshall not be considered as a SINGLE FAULT CONDITION.
3 Q- \2 @" p% M! @5 u3 ~! aTime periodicity for the detection of fault depends on the risk analysis
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